Russian cosmonauts successfully deploy vital radiator during ISS spacewalk.

Russian cosmonauts Sergey Prokopyev and Dmitry Petelin completed a 5-hour spacewalk to activate a radiator that they earlier helped relocate outside of the International Space Station. The radiator was deployed on the Nauka module, and the cosmonauts also installed two gap spanners on the European Robotic Arm and completed a few "get-ahead" tasks for future spacewalks. This was the third and last in a series of spacewalks to outfit the exterior of the Nauka module.